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Do not trust vmstat IOwait numbers

 | June 3, 2014 |  Posted In: Benchmarks, Insight for DBAs, MySQL, Percona Cloud Tools, Percona Server

I’ve been running a benchmark today on my old test box with conventional hard drives (no raid with BBU) and noticed something unusual in the CPU utilization statistics being reported. The benchmark was run like this:

Which means: create 64 threads and hammer the database with queries as quickly as possible. As the test […]

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